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Moscow (AFP) - The Russian passenger jet that crashed in Egypt killing all 224 people on board came down due to "external" factors, the airline said Monday, as relatives began identifying their loved ones in Saint Petersburg.
Senior Kogalymavia executive Alexander Smirnov said that "no technical failures" could account for why the Airbus 321 would have broken up in mid-air, as investigators have said happened.
"The only explanation is some kind of external action," Smirnov told a news conference in Moscow, without elaborating, adding that the doomed jet was in "excellent technical condition".
But the head of Russia's aviation authority Alexander Neradko slammed the airline's claims that external factors were to blame as premature.
Both Cairo and Moscow have played down the claim from Egypt's Islamic State (IS) branch that it brought down the aircraft flown by Kogalymavia between holiday destination Sharm el-Sheikh and Russia's second largest city on Saturday.
The US Director of National Intelligence James Clapper said Monday he could not rule out IS involvement, but thought it "unlikely".
"We don't have any direct evidence of any terrorist involvement yet," he said.
Investigators are examining all possible causes as they comb the remote crash site in the Sinai peninsula as part of an Egyptian-led probe into the disaster that also involves experts from Russia, Airbus, and Ireland, where the aircraft was registered.
Egyptian authorities said that investigators from the probe team were currently examining the "black box" on-board recorders from the doomed jet in Cairo.
Neradko said officials had been able to get a close look at the black boxes, noting they were in good condition.
- 'Huge tragedy' -
President Vladimir Putin described the crash, Russia's worst air disaster, as a "huge tragedy" in his first comments since the catastrophe.
"Without any doubt everything must be done to create an objective picture of events so that we know what happened and can react accordingly," Putin said.
Kremlin spokesman Dmitry Peskov said Moscow "cannot exclude any version" but warned against "guessing" the reason.
Russia has a dismal air safety record, and while larger carriers have begun upgrading ageing fleets, the crash is likely to raise concerns about smaller airlines such as Kogalymavia.
The company's executive Smirnov said the firm had ruled out a technical fault or human error and said the plane had sustained "significant damage to its construction that did not allow it to continue the flight."
"The crew totally lost control and for that reason there was not one attempt to get in contact and report on the accident situation on board," Smirnov said.
The plane was "flying out of control -- that is, it wasn't flying, it was falling," he said.
- 'Meticulous work' -
The claims by the airline came as relatives of those who died in the crash began the painful process of identifying their loved ones after a first plane delivered the remains of 140 victims to Saint Petersburg.
"The process of identification has begun. It is complex, meticulous work," Saint Petersburg deputy governor Igor Albin told journalists outside the crematorium where the remains are being stored.
Albin added in the evening that a second plane with belongings and the rest of the remains was preparing to leave for Russia.
Earlier in the day, cars ferried relatives of the dead -- overwhelmingly Russian holidaymakers from the Saint Petersburg area -- to the crematorium.
Family members had already been providing DNA samples at a crisis centre set up near Saint Petersburg's Pulkovo airport, now the site of an impromptu memorial where people have brought flowers and cuddly toys to commemorate the victims, many of them children.
Saint Petersburg was observing a second day of mourning for those lost in the crash.
The Kremlin said multiple condolence messages kept coming from all over the world including Syrian President Bashar al-Assad and US Secretary of State John Kerry.
- 12 fuselage segments found -
Investigators in the Egyptian-led probe returned to the vast crash site on Monday, an official told AFP.
Russia's emergencies ministry said it hoped its crews would complete their search mission at the remote location on Monday evening.
A ministry official told Russian reporters that investigators had so far found 12 segments of the plane's fuselage as well as personal belongings.
Analysts have dismissed claims the jet could have been shot down by IS-affiliated groups in the region if it was flying at its cruising height of 30,000 feet (9,000 metres), but did not rule out that a bomb might have been planted on board.